uint8_t bcal_eax_init(const bcdesc_t *desc, const void *key, uint16_t keysize_b, bcal_eax_ctx_t *ctx){
uint8_t r;
ctx->blocksize_B = (bcal_cipher_getBlocksize_b(desc)+7)/8;
ctx->nonce = malloc(ctx->blocksize_B);
if(ctx->nonce==NULL){
return 0x81;
}
r = bcal_cmac_init(desc, key, keysize_b, &(ctx->ctag));
if(r){
return r;
}
r = bcal_cmac_init(desc, key, keysize_b, &(ctx->htag));
if(r){
return (r|0x10);
}
r = bcal_cmac_init(desc, key, keysize_b, &(ctx->ntag));
if(r){
return (r|0x20);
}
r = bcal_ctr_init(desc, key, keysize_b, NULL, &(ctx->cipher));
if(r){
return (r|0x30);
}
ctx->header_set=0;
uint8_t tmp[ctx->blocksize_B];
memset(tmp, 0, ctx->blocksize_B);
bcal_cmac_nextBlock(&(ctx->ntag), tmp);
tmp[ctx->blocksize_B-1]=1;
bcal_cmac_nextBlock(&(ctx->htag), tmp);
tmp[ctx->blocksize_B-1]=2;
bcal_cmac_nextBlock(&(ctx->ctag), tmp);
return 0;
}
void testrun_aes128_ctr(void){
uint8_t key[16];
uint8_t iv[16];
uint8_t plain[64];
bcal_ctr_ctx_t ctx;
uint8_t r;
memcpy(key, modes_key, 16);
memcpy(iv, modes_ctriv, 16);
memcpy(plain, modes_plain, 64);
cli_putstr("\r\n** AES128-CTR-TEST **");
r = bcal_ctr_init(&aes128_desc, key, 128, NULL, &ctx);
cli_putstr("\r\n init = 0x");
cli_hexdump(&r, 1);
cli_putstr("\r\n key: ");
cli_hexdump(key, 128/8);
cli_putstr("\r\n IV: ");
cli_hexdump(iv, 128/8);
cli_putstr("\r\n plaintext:");
cli_hexdump_block(plain, 4*128/8, 4, 16);
if(r)
return;
bcal_ctr_encMsg(iv, plain, 4*128, &ctx);
cli_putstr("\r\n ciphertext: ");
cli_hexdump_block(plain, 4*128/8, 4, 16);
bcal_ctr_decMsg(iv, plain, 4*128, &ctx);
cli_putstr("\r\n plaintext: ");
cli_hexdump_block(plain, 4*128/8, 4, 16);
bcal_ctr_free(&ctx);
}